Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7a57cb3a411e41…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 11:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0f3574fc7805944c0366f6fb26f1974 SHA-1: 2b8024db445a2e979b98032412c88f2928ffeeb1 SHA-256: df7a57cb3a411e419ee2a1e47ad67de8d53a041f25bd76f646caaf14ec85cfe8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://deltaguvenlik.net/userfiles/file/mixitilelegorif.pdf In PDF document text
    • http://beiwendq.com//data/attachment/file/64257574101.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3732cbac0d948d5e25a797b880bde23e/2257627962.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/41729408657.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/vesoxubirimesalivadogesun.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108132138049613.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/govowasemofuvozosofurobod.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xitonitujulutunisuweda.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/57568100102.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/nigux.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4a74f145cb3cc4945379c62b36f6c6a6/zaxabazajetum.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/xipuvejudatizobabetawo.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/menotajovobekamo.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6mag4vqvrg4so4ldprjcl3tar2/bifimalu.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/diwakiguzedodulasuti.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/663d287aa059aa0d104179029020868b/mironifunone.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/31519136372.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16117066d81054---wiviwizep.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca13fea47e---pagoxejufarepax.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/waxefesi.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/wovepowul.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/57579443384.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612115c1bc511---zomego.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/8505129817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rainsoft+silver+series+water+softener+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 17784 bytes
SHA-256: b470120be9f9a206e269f74e020290597a1640fd48eeeae4a088f97bc6e921cd
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 10672 bytes
SHA-256: bf9cca53974dc0662aac90f0a7620ff42438285ea95807b43eefd354d6f8367e

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